(Lincoln wraps a towel around his waist and gets out of the bathroom. He heads to his room and opens the door to reveal a naked Adult Lisa sitting on his bed.)

Lisa: "You needed somewhere warm? Come to my bunker and I'll show you..."

Lincoln: "OK..."

(Lisa teleports herself and Lincoln to her bunker with her harness.)

Lincoln: "Okay, and what is warm in your bunker besides your jacuzzi?"

(Lincoln glances at his left to see Luan and Lola, both naked and in their adult forms, behind a white tarp.)

Luan: "It's about time you showed up..."

Lincoln: "Why are Luan and Lola here?"

Lisa: "Oh, it's for a little experiment I'm concocting."

Lincoln: "The tarp?"

(Luan and Lola pull away the tarp to reveal a sauna.)

Lincoln: (deadpanned) "This is the best you can do?"

Lisa: "I'm seeking to figure out how high temperatures will affect mating behavior."

Lincoln: "Oh, okay. Now I see."

(On each side of him, Luan and Lola each cuddle Lincoln's arms.)

Lola: "Come on, Linky. Let's get this party started."

Luan: "By now, you wouldn't break a sweat doing us." (laughs)

Lincoln: "Well, alright…" (excited) "Oh, what the hell? Let's do it!"

(The four Louds head into the sauna, as they sit on the benches inside.)

Lincoln: "Now this is more like it!"

Lola: "Your log's looking pretty limp there…" (licks lips)

(Lola gets on her knees in front of Lincoln and sucks on his cock to get it hard, gripping his legs.)

Lincoln: "Good girl… Suck more of that motherfucker…"

(Lola continues to suck on Lincoln's log to get it hard enough to their liking. She moves her mouth off, as Lincoln's log rises up.)

Lola: "There we go… Rock hard, as all cocks should be…"

Lincoln: (to Lola) "Thanks, Lolly-pop… Let's bang..."

(Lola lies on the floor and spreads her legs, as Lincoln sits on his knees in front of her. As he's stroking his cock, he pushes it into Lola's pussy, making a huge bulge in her slender belly.)

Lola: (screams) "Not too rough, my white sweet…"

Lincoln: "Sorry, Lola…"

(Lola puts her hands on Lincoln's shoulders as the latter fucks her.)

Lola: "Yeah, pound this princess pussy!"

(Lincoln leans down and kisses Lola on the lips, gyrating his hips to feel more of her pussy.)

Lola: "Yeah, feel more of me…"

(As Lincoln and Lola make love to each other, their bodies turn into a red color.)

Lisa: "It's working!"

Lola: (looks at her hands) "What happened?!"

Lisa: "It's the sauna! Every time we make love here, our body heat increases!"

Lincoln: "What?!"

Lisa: "Don't worry… It's not harmful to our bodies…"

Lola: "Maybe your cream will take the red away…"

(Lincoln thrusts a couple more times into Lola, cumming inside her pussy. He pulls out and strokes his cock over her, coating her body in white.)

Luan: "Did it work?"

Lola: "I think so… Some spots aren't red anymore…"

Lisa: (nervously laughs) "Oh, yeah… One thing…"

Lincoln: "Yeah?"

Lisa: "Our semen gets hot too…"

(In an instant, Lola screams in pain.)

Lola: "This is like lava all over me! Get it off! Get it off!"

Lisa: "Chill out… This sauna got different modes on it…"

(Lisa pulls out a remote and it has lots of buttons on it. Lisa presses a blue button and the sauna instantly forms a blue hue around.)

Lola: (relaxed) "Much better…"

Luan: "Lola, if you can't take the heat, then get outta the sauna." (laughs)

Lola: "Oh, that was just awful, Luan! And not to mention insulting."

Luan: "Hey, Linc! Get your meat in this freezer box before it thaws!" (spreads vaginal lips)

Lincoln: "Yeah, yeah. Let me shoot the rest of my load into Lola first…"

(Lincoln shoves his cock back in Lola and pumps her full with his cum.)

Lola: "Thanks, Linky…"

Luan: "Now get on the bench…"

(Lincoln sits on the bench with his member standing straight up, as Luan approaches him.)

Luan: (laughs) "Let's see if you handle me in this heat…" (to Lisa) "Turn it up!"

(Lisa turns the temperature up, as Luan flicks Lincoln's cock around with her fingers.)

Luan: "God, you're so stiff… Let's see how this fish stick can handle the microwave…"

Lisa: (facepalms) "My god, what cheesy wordplay…"

Luan: "Better yet, let's see when this long stick of butter melts…"

(Luan stands over Lincoln, her pussy leaking juices on top of his cock. Luan squats down, taking all of Lincoln inside her pussy, and grips his shoulders.)

Luan: "Oh, yeah! Now we're cooking in this kitchen!"

(Luan bounces on Lincoln's groin as she locks lips with him.)

Lincoln: "Your lips are hot, sis…"

Luan: "Thanks, Linc… I bet my tongue is hot too…"

(Luan slithers her tongue into Lincoln's mouth as she gropes onto his chest muscles. Their bodies get warmer too as they bang each other.)

Luan: "You thew is pretty great."

Lincoln: "What does thew means?"

Lisa: "Thew means strength, elder brother. She's talking about your muscles."

Lincoln: "Gotcha."

(Lincoln shoots his hot load into Luan's pussy, but he's not pulling out.)

Luan: "Oh, you're not pulling out? You wanna keep going..."

Lincoln: "Hell yeah…"

(Luan removes the scrunchie, letting her hair fall.)

Luan: "Let's put this in reverse…"

(Luan gets off of Lincoln and turns around, putting his log back in. Now, Luan is banging Lincoln reverse cowgirl.)

Lincoln: "Yeah, yeah! Take this cock, sis!"

Luan: "Yeah, pound me with your hot meat!"

(Lincoln goes faster into Luan's womb while he's squeezing her huge, sweaty breasts. He then twists her nipples, making her excitedly bite her lip.)

Lincoln: "Come on! Moo for me, girl!"

(Luan moos, as Lincoln fucks her crazily and milks her breasts.)

Lincoln: "That's a good girl… Now squirt that milk out!"

(Luan lets her tongue out and moans in ecstasy, as milk squirts out of her nipples and onto the sauna floor.)

Lincoln: "Nicely done… Now here comes the yogurt…"

(Lincoln grips Luan's body and holds her down in his cock, as he fills her pussy up with his cum.)

Luan: "You did good, brother… You did good."

(As Luan gets off Lincoln, their mixed cum leaks out her pussy and drips down her legs.)

Luan: "So much cum lately…"

Lincoln: "Yeah, I know…" (to Lisa) "Come over here…"

(Lisa comes over to Lincoln, as he's stroking his cock.)

Lincoln: "Get on your hands and knees, and make this cock spotless…"

(Lincoln points his cock towards Lisa's face, as she takes his tip into her mouth. Lisa steadily takes the rest of his cock down her throat, as she delightfully sucks on it like a popsicle.)

Lincoln: "Yeah, suck on this popsicle…"

(While Lisa is sucking on Lincoln's cock, Lola makes out with Lincoln and Luan is caressing Lincoln's biceps.)

Lincoln: "I dunno what's hotter, this sauna or my three gorgeous sisters…"

(Lincoln quickly thrusts deep into Lisa's throat, making her eyes roll back in pleasure. Lola's tongue goes deeper into Lincoln's throat and Luan is now licking Lincoln's earlobe.)

Lincoln: "That's it…. Pamper me as long as you want…"

(Lincoln grunts, as he bursts his load into Lisa's gullet, who obediently gulps down each and every drop.)

Lincoln: "Nice, Lisa! Now give me that ass!"

(Lisa stands up and turns around, spreading her buttcheeks apart to show her goods.)

Lisa: "May I suggest tending to my taut rectum with your phallus?"

Lincoln: "Whatever that means, sure!"

(Lincoln stands up and holds Lisa against a wall, plunging his cock into her tight asshole.)

Lisa: (squeals) "That's it!"

Lincoln: "I'm gonna mold this nice ass into my new personal cocksleeve…"

(Lincoln pounds Lisa's asshole, as she squeals after every thrust. Lisa removes her glasses and sets them down on the bench.)

Lisa: "Mmm… Defile me like you would a filthy little prostitute!"

Lincoln: "I'm planning to!"

(Lincoln goes faster into Lisa's anus; he cums into her asshole.)

Lisa: "That was great, brother…"

Luan: "He's a real professional when it comes to baking creampies."

Lola: "Okay, that one I like..." (to Lincoln) "And he's a hunky brother!"

(Lincoln gets an idea and lifts Lola above his head.)

Lola: (giggles) "Oh, Linky… Showing some chivalry, I see…"

Lincoln: "So, Lisa... What other fun inventions do you have packed down here?"

Lisa: "Let's see…" (puts on her glasses) "I've got some stuff outside the sauna I've been meaning to test for quite some time…"

Luan: "Okay, let's go."

Lola: "Ah, ah, ah." (sitting on Lincoln's lap) "Five more minutes with me, sweetheart."

(Lincoln traces his fingers up Lola's legs and her thighs, earning some soft moans from her.)

Lola: "Oh…" (chuckles) "Getting seductive, aren't we?"

Lincoln: "Yeah, babe…"

(Lola smooches Lincoln's cheek, who returns it.)

Lisa: (to Luan) "Let's go."

Luan: "Yeah… Let the king and queen get some alone time…"

(Luan and Lisa leave, while Lola and Lincoln make out with each other.)

Lola: (breaks kiss) "Lay down, Linky… I need another serving of your yummy sausage for the day…"

(Lincoln lays down on the bench with his cock up in the air. Lola hovers over Lincoln and takes his whole cock into her mouth and down her throat.)

Lincoln: "Lola, can I have a taste of you? You must be super wet by now…"

Lola: "Sure, my white king…" (ruffles Lincoln's hair)

(Lola shifts her body, her rear now hovering above Lincoln's face. He grips her buttcheeks and pulls down on a Lola so he can eat her pussy.)

Lola: "Now then, back to my huge throbbing meal…"

(Lola sucks on Lincoln's cock again, as the two are 69'ing each other. Lincoln grabs Lola's butt and shoves it in his face, taking more of her pussy in his mouth.)

Lola: "Great work with that tongue, Linky…"

Lincoln: "Thanks, now put that mouth to good use…"

(Lola licks all around Lincoln's shaft while it's in her mouth, as Lincoln suckles at her clitoris.)

Lola: (muffled) "I love this huge piece of meat in this warm sauna…"

(Lincoln cums into Lola's mouth, who gleefully drinks each load burst. Lola cums into Lincoln's face, coating it. He smacks Lola's asscheeks around, as she gasps.)

Lola: "You little…!"

(Lola suckles on Lincoln's balls and strongly strokes his cock to force him to cum more.)

Lincoln: "You wanna play rough? Let's play rough!"

(Lincoln vigorously fingers both Lola's vagina and anus to get her to climax too.)

Lola: (moaning) "You sexual fiend!"

(Lola then gets up and slams her pussy down on Lincoln's cock, causing him to scream out in ecstasy.)

Lola: "I'm in control now!" (cackles)

Lincoln: (smug) "You sure about that?"

(Lincoln sits up and pushes Lola onto the floor; he grips both her breasts and proceeds to fuck her brains out.)

Lincoln: "How do you like it now, bitch?!" (gasps; shuts himself up)

(Upon hearing that, Lola sits up and tightly grips Lincoln's shoulders.)

Lola: "Who told you to stop, Linky? Make this queen bow down to your king's staff…"

(Lola pushes Lincoln on the floor as she gets on Lincoln's log again.)

Lola: "Now… Really let me have it!"

(Lincoln grips Lola's hips and furiously thrusts into her pussy, as she squeals in delight.)

Lola: "Yeah, make me your royal whore!"

(Lincoln thrusts even more, to the glee of Lola. It cuts to Luan and Lisa.)

Luan: "So, Lis, whatcha working on?"

Lisa: "I'm dabbling with the likes of things that guarantee the greatest of female orgasms."

Luan: "So… Sex toys, basically?"

Lisa: "No. It's something completely different."

Luan: "Oh yeah? Let's see the goods, then."

(Lisa shows Luan a metal closet. She opens it to reveal several vials and serums.)

Luan: "What are all these for?"

Lisa: "They're for testing on orgasms. I made some for both male and female purposes."

Luan: "What kinds?"

Lisa: "Orgasms from foreplay, vaginal and anal sex, oral, and mammary-based ones for females."

Luan: "And the males?"

Lisa: "Those pretty much involve their genitalia exclusively."

Luan: "But don't females use their genitals for cumming too?"

Lisa: "Yes. But things go differently for both serums…"

(Lisa takes out three pink and yellow vials and a blue and white one from the closet.)

Lisa: "Let us make our return to the sauna."

Luan: "Let's."

(Luan and Lisa go back to the sauna to see Lola riding on Lincoln's log as he makes out with her. The two cum at the same time as they hold each other's bodies close together.)

Lola: "My king… You did astoundingly…"

Lincoln: "Anything for my adoring queen…"

Lola: "Don't pull that amazing log out… I wanna stay like this…"

Lincoln: "As you wish…" (to Lisa) "Whatcha got there, Lisa?"

Lisa: "More serums to spice things up…"

Lola: "Gimme, gimme!" (reaches hand out towards Lisa)

(Lisa gives Lola a vial, then gives Luan one and Lincoln the blue and white one.)

Lisa: "Drink up, guys…"

(As Lisa, Lola, and Luan drink their serums, Lincoln looks at his vial.)

Lincoln: "Lisa, are you sure this is safe?"

Lisa: "Positive."

(Shrugging, Lincoln downs the liquid in his vial.)

Lincoln: "Huh? It didn't taste that bad--" (clutches stomach) "Ooooo!"

(As Lincoln's in pain, his ballsack starts growing in size, in addition to his cock and buttocks.)

Lincoln: "What's happening?!"

(Lisa, Lola, and Luan's breasts and posteriors grow in size too, with their nipples hardening.)

Lincoln: "Holy shit…"

Lola: "Wow! Look at these things! They're even bigger now!"

Lisa: "It worked!"

Luan: "And we've got more junk in our trunks…" (wiggles her ass)

Lola: (giggles) "And look… Our little prince has gotten even bigger now..."

(Lola sits on her knees in front of Lincolm, as she feels up his bigger, but now limp dick.)

Lola: "I'm sure I can get all my sausage in my mouth, no matter how big it gets…"

Luan: "Hold up! I want this too!"

Lisa: "Same! My experiment caused this!"

(The three girls are on their knees with their hands on their laps, licking all around Lincoln's shaft to his satisfaction.)

Lincoln: "Oh, yeah. Lick around my huge package, ladies…"

Lola: "You got such a majestic log for such a handsome gentleman, Lincoln…" (giggles)

Luan: "Agreed. We should log on for more info…" (laughs)

Lisa: "Yeah. This amorous experiment is working expenionally…" (chuckles)

Lincoln: "Now, get my balls too, girls…" (lifts cock upwards)

(Luan, Lola, and Lisa envelop their faces in Lincoln's ball sack, licking and suckling at it.)

Lincoln: "Oh, hell yeah… Suck my balls..."

Luan: "Your meat balls…" (laughs)

Lola: "Don't need spaghetti to enjoy these…"

Lisa: "Yeah… These balls are the best…"

(Lincoln squirts his cum up in the air, drenching the girls with his semen.)

Lincoln: "That was great…"

Lisa: "As tasty as your semen is, I need to wash this off…" (half-lidded) "And I got just the gadget to do it…"

(Lisa pulls out a remote to reveal another door outside of the sauna.)

Lincoln: "And where does this lead to, Lisa?"

Lisa: "Some body cleansing stations…" (grabs Lincoln's log) "Come with me…"

(The four of them exit the sauna. Lincoln is walking towards the door while Lisa is groping on his log and Luan and Lola are hugging each side of him.)

Lola: "Who knew that our darling Linky could grow up to be this dashingly handsome and strong?"

Lincoln: (blushes) "Oh, Lola… You're too much…"

Lisa: "Okay, let me put in the secret pass--."

Luan, Lola, and Lincoln: "It's your birthday!"

Lisa: (narrows eyes) "Haters…"

(Lisa inputs the passcode, unlocking the doors.)

Lincoln: "Whoa…"

(What's behind the doors is a huge hot spring, complete with grass, trees, shower heads, chairs, and geysers.)

Luan: "Wow… This is amazing..."

Lola: "How did you manage to build all of this?"

Lisa: "I have time away from you guys, you know…"

Lincoln: "Oh, right…"

(The four head inside, as they get into the springs to bask in its warmth.)

Lincoln: (relaxed) "Oh, yeah… Now this is relaxation…"

Lola: "Mmm… This water's just so nice…"

(Lola sinks her body deeper into the spring, with only her head above the water and her hair floating on it.)

Lincoln: "Is it me, or am I feeling a little drowsy?" (yawns)

(As Lincoln is relaxing, someone is lurking into the water near him. Adult Leni rises up and cuddles Lincoln from behind.)

Leni: "Got you!" (giggles)

Lincoln: "Hey, Leni. How'd you get down here?"

Leni: "Oh, I just miss you so much, so after you and Lisa poofed away, I went to the bunker… It's been so long since I've had your fun meat..."

Lincoln: "Whatcha say, Lisa… Room for one more?"

Lisa: "Sure thing."

Leni: "Excellent…"

(Leni sits on Lincoln's lap and lowers her pussy on his log as she grips Lincoln's shoulders.)

Lincoln: "I missed your pussy, sis… Now ride me!"

(Leni pushes Lincoln's face into her breasts, as she rides him like a bull.)

Leni: "Yeah, yeah! Be in my bosom!"

(Behind Leni, Luan is licking her earlobe. She then licks across Leni's neck and gives her light hickeys.)

Leni: "Giving me hickeys, aren't we?"

Luan: "Yep. I'm hick-ing for this moment." (laughs)

(Lincoln pulls away from Leni's bosom and grips her breasts, firmly kneading them. He licks around her nipples and then sucks on them.)

Leni: "Yeah, get my nipples…. Suck on them…"

(Leni's breasts lactate, allowing Lincoln to drink her milk.)

Lincoln: "I always love your milk…"

Lola: "While you're drinking Leni's milk, put that cock in my pussy…"

(Leni gets off of Lincoln's cock and stands by his side, holding his head and ruffling his hair as she's breastfeeding her. Lola grips his dick and shoves it inside herself.)

Lola: "Oh, yeah! Time for the queen's daily fucking!"

(Lola rides on Lincoln's log while Leni breastfeeds him.)

Lisa: "Don't forget about us…"

(Lisa plants her breasts on Lincoln's head as she rubs them while Luan opens her pussy and Lincoln fingers her.)

Lincoln: "Oh, yeah… Pamper me, girls!"

(As Lincoln enjoys getting banged by Leni, Luan, Lisa, and Lola, the five of them all cum on each other. Lincoln gets off of Lola as he falls flat on his back into the water, floating on top.)

Lincoln: "Man… So much sex in a single day…"

Lola: "Yep, but it was totally worth it…"

Leni: "Yeah, it sure was, especially with such a dreamboat for a brother…"

Lincoln: "Thanks… Hey, how about this weekend, the eleven of us all spend it together as adults?"

Lisa: "Great suggestion…"

Lola: "Yeah!"

Leni: "Also, we won't be needing clothes during the weekend, either… That way, we can have fun with Linky quicker…"

Lincoln: "I actually meant in public, Leni... But that can work too."

Lisa: "We can remain nude within our premises. How's that, elder sister?"

Leni: "Okay!"

Luan: "So, where should we go? I'm thinking of an amusement park!"

Lola: "You mean Dairyland? But why?"

Luan: "Well, it's been a long time since I've been there."

Lincoln: (half-lidded) "And it's one of the best places to find fresh milk…" (looks at the girls' breasts)

Lisa: "Oh, you…"

(Lincoln rises from the water.)

Lincoln: "I think it's time to get out."

Lisa: "Let's. It's getting rather late, anyways..."

(The five of them get out of the hot spring as they use Lisa's harness to teleport back into Lincoln's room.)

Lincoln: "Okay, that's enough for tonight… I need to sleep..."

Lola: "Hey, Linky, can I sleep with you?"

Lincoln: "I don't see why not… But no fooling around…"

Lola: "Eeeee!"

Leni: "Can I, too?"

Luan: "And me?"

Lisa: "And me?"

Lincoln: (groans) "Fine… But four sisters is my limit."

Lola: "Works for us. Oh, and don't even bother putting on PJs. We're all sleeping ain't naturel…"

Lincoln: (sarcastic) "You guys love being nude so much, why don't we all become nudists?"

Leni: "O-M-G! That's an amazing idea, Linky!"

Lincoln: "What?! I was joking!"

Leni: "What? You don't want to stay nude?"

Lincoln: "Sis, no… We're not being nudists..."

Leni: "Listen, nobody knows about our adult forms and they don't know it's us. Naked or not."

Lincoln: "Are you fucking serious right about now? Can we go to bed and talk about this nudist thing tomorrow?"

Leni: "Alright. Don't get upset, Linky…"

(Lincoln lays on his bed with the others cuddling hin.)

Leni: "I'm telling you, it's a good idea…"

Lincoln: "It's really not."

(The five of them all go to sleep for the night.)