This takes place when the gang is in college and Adam is a college professor.

So Echo ill be at your house tomorrow by 6 to tutor you on today's lecture.
Echo's house 5:30 pm
As Adam approached the door he noticed that the door was opened ajar and went in to make sure all was ok. As he approached the stairs he heard moans coming from upstairs and rushed up to see if anything was wrong. Adam opened Echo's bedroom door ever so slightly that she couldn't here and that only he could see her and that she couldn't see him. And what he saw and heard shocked him. As she was. Masturbating to him. "Ohh Adam oh ya fuck me fuck me in my tight little pussy fuck me ohh I'm so close harder make me cum on that big rock hard dick of yours and with that she came hard on her fingers and began to suck them dry. As he began to back up he heard the hallway carpet squeak and made a dash for the front door. And after he made it to the front door he closed the door and rang the doorbell. Coming Adam! Echo said sti slightly exhausted from her little "session". After about a minute she came down and opened the door. Hey Adam your early. Yeah I just wanted to be here early for our sexy session. I mean study session. Ohh ok. She said a little worried. So shall we study? She said guiding him to her large lazy boy couch.
After about half an hour of learning about genes. Echo asked Adam, so did you enjoy the show? What Adam said obviously caught off guard. Ohh come on! Echo said. I know you saw me masturbating earlier. Well... Adam said. But before he could finish Echo put her lips to his and started passionately kissing him. Adam then began engaging in their make out session and wrapped his arms around her. Then she pulled away and noticed his erection. Well Mr. Young someone is excited! she said in a seducing tone. As she took off her shirt and bra all in one swift motion and then yanked off her pants revealing tat she had no underwear. She then got in between his legs and took both hands and began to take off his pants and boxers revealing a 10 inch dick that slapped her in the face. She then looked up. And with an approving nod from Adam began to kiss the his head and lick up his pre-cum. Ohh Echo was all that Adam could say. She then began to lower her mouth onto his shaft to try to deepthroat him. But to no avail only got 7 inches. She than took her mouth off and began to lick the rest all the way around. Echo I'm cumming she than took her right hand and began to jerk him off saying its ok I want all of your sweet juices on my face and then continued to jerk him off until he shot 6 Long streams of semen onto her awaiting face. 1 hitting her ear two hitting her nose and three she caught in her mouth and swallowed it all. Now Mr. Young we're going to switch roles I'm going to be the teacher and you the student and for your first assignment I want you to successfully transport a mouthful of my cum from my pussy to your mouth and into mine all with out the use of your hands. And with that Adam dragged his teeth from her neck to her right breast making sure to use his tongue give them a thorough once over. Then began to drag his tongue down to her stomach and then and stopped and placed his teeth at her entrance making her complain. Adam! Adam! He then took his tongue and licked the outside lips of her pussy and then used his teeth to slowly peel back the layers of her center making her buck her thighs hitting him in the face multiple times with her center trying to get his tongue into her pussy. Then seeing as she had enough he placed his tongue into her vagina and jammed it in and out back aNd fourth making sure no area went unchecked. Then after about 5 minutes of eating her out Echo began to scream at the top of her lungs Adam I'm cumming I'm cumming! Then she bucked her hips and came hard into his mouth overflowing it. As he trailed his way up he intentionally dropped little drops of her cum onto her stomach breasts until finally he slowly dripped her film into Echo's horny awaiting mouth. After savoring her cum she swallowed it and said mmmm I taste good! Now for your next assignment you are to Make me cum using the rock hard cock of yours. Then he used the head of his shaft to rub the cum he dripped from earlier and rubbed it gently around in circles around each tit and slid it in between her breasts and began to move it up and down stimulating her already wet pussy making her moan in pleasure and scream in need for cock in her tight virgin pussy. Adam take me now! Now now Adam said playfully is that any way to respect your teacher. Mr. Young I need you big thick cock in my tight pussy now! Please. She said in a begging tone. Alright then he centered his head with her entrance and then rammed her pussy breaking her wall on the first strike. Auuuugggghhhhh. Echo cried in pain. Then after a few more pumps she started to moan in pleasure. Auughhhhh fuck me Adam fuck your little student I'm such a slut aren't I Adam seducing my teacher and making him fuck me. Then Adam turned them around so that her ass was facing him and then began to spank her. Oh spank your slut soank me hard I've been a bad girl having my teacher take my virginity aren't I bad.
Spank
Spank
Spank ohh
Then she cried Adam I'm cumming then before she could climax Adam pulled out and jammed three fingers into her entrance and finger fucked her. Ohh Adam ohh fuck I'm cumming then she came hard onto his hand. After she came Adam jammed his dick back into her pussy using her juices as lining before he put it in her ass. Catching her off guard and making her squeal. After fucking her ass he finally said Echo I'm cumming ok Adam cum in my ass. Then with that he came into her sweet perky ass ad. Then pulled out and layer back only to have his sweet student lover turn around and suck the remaining cum off his penis leaving it dry. Then she joined him on the couch where she cuddled in his arms resting her pussy over his stomach and breasts on his chest.