A/N: Hello everyone. I may lose some of you with this chapter but you can always skip ahead and not read.

This chapter is a lemon between Rin, Izumi, Sesshomaru, and Kohaku with yuri and partner swapping.

I have wanted to write this foursome since Kohaku and Izumi became a couple but had no idea how to approach it. Well, I figured it out.

Enjoy!

As Izumi helped Rin let her hair down Rin was uncharacteristically quiet.

"Are you alright?" Izumi asked softly.

"Yes. I was thinking." She replied. "Izu, does it bother you that we are not intimate?"

"We are, in our own ways." Izumi said.

"Is it enough for you?" Stopping what she was doing Izumi knelt down in front of Rin to look her in the eye.

"I enjoy every moment I have with you, that you spend with me. I love being close to you, holding you. Caring for our pups together, I do not wish for anything more Rin."

"But you would like more." Rin stated to clarify.

"Only if you are comfortable with it." Izumi replied. With that Rin leaned forward but Izumi stopped her. "The toxins."

"Rinse your mouth out with water a few times. I will be alright." She said.

"Are you sure?" Izumi asked feeling her head swim uncertain if it was from the drink or her own anticipation.

"Yes. I am." Rin nodded her head once in affirmation. Izumi went to the basin and water pitcher taking some water and swishing it in her mouth well before spitting it out repeating a few times.

Once she no longer tasted the drink on her tongue she went back over to Rin. Kneeling in front of her again Rin took her chin between two of her fingers and leaned towards her kissing her full on the lips.

Izumi closed her eyes breathing in Rins scent tasting the sweet raspberries on her mouth. Letting out a soft growl she hesitantly licked at her lips gently. Rin parted her mouth allowing Izumi to greet her own tongue wrapping her arms around her middle.

Rin moved her hands to Izumis shoulders before wrapping her own arms around her. Exploring one another in such a way they broke apart. Rin set to removing the headdress that Izu wore placing it down on the futon.

Pushing down the shoulders of her robe Izumi let it fall to the ground as she stood. She removed Rins as well setting to work on the obi untying it while Rin removed hers.

Izumi let out a shaky breath and placed her forehead to Rins bumping her nose against hers. Taking in her scent she moved to lick up her cheek slowly. Rin trembled at that embracing Izumi again and capturing her lips in another kiss.

Opening up her kimono Rin broke their lip lock removing hers. Looking at her friend she still seemed apprehensive. Standing on the futon she took off her undergarment and began undoing the bindings around her breasts.

Once she was nude she coaxed Izumi to stand again taking hers off as well and moving around her to unbind her. They had been around one another many times in various stages of undress but still Izumi and Rin felt the difference that this situation brought.

Lying down together on the futon to face each other they explored one another's bodies with their hands in ways they hadn't before. Kissing, licking, and smelling one another as they went.

Izumi ran her thumb over one of Rins hardened nipples feeling some milk leak out. Growling low she adjusted herself licking at the drops as Rin entwined her hands in Izumis hair.

Rin let out a soft moan encouraging her to take more of her in her mouth. Sucking gently she massaged its twin feeling Rin begin to squirm against her.

Moving back up her body she could see and scent Rins arousal. Her brown eyes seemed to shimmer in the firelight and her lids were dropped somewhat. She breathed slowly as if she were trying to catch her breath.

Propping herself up on her elbow Rin ran her hand down Izumis side pausing at her stomach tracing the marks and stripes that she had acquired during pregnancy.

Smiling softly at her Rin brought her hand lower slowly as if testing out the new territory.

Closing her eyes Izumi held her breath feeling Rins soft fingertips begin to explore between her legs. Licking her lips she swallowed hard as Rin pushed two of her fingers in and began to slowly withdraw them.

"Oh Rin." Izumi whispered out resting her head against Rins chest and licked at her breasts again. Kissing at her face Rin increased her speed scissoring her fingers as she did so feeling every inch inside of her friend, now lover.

The idea made her smile as Izumi began to let out a soft whimper and ground her hips against the contact. Panting Rin felt the muscles of her well tighten around her making it near impossible for her to move anymore.

Izumis eyes went wide as she gasped and whined. Rin let out a soft chuckle and coaxed her fingers out of Izu.

As she met her gaze Rin saw something she had witnessed in Sesshomaru before, a type of ferality overtook her as she growled deep in her chest.

Changing position she had Rin underneath her dragging her tongue up her neck, nipping at her skin and drawing small beads of blood that she quickly devoured.

"Yes." Rin moaned out wrapping her arms around her. Izumi dragged her tongue down Rins body reaching her center, her small bud that she had been interested in since Rin had explained her anatomy to her.

Clutching at her hair as Izumi licked up her slit Rin moaned loudly arching her back at the contact. Her tongue wasn't as rugged as Sesshomarus was, it was softer, bringing on a different type of sensation as she swirled it around the inside of her folds.

Suddenly Izumi stopped turning her head to look behind her emitting what sounded like a warning growl. Rin lifted her head from the pillow and instantly blushed as her eyes widened.

Sesshomaru and Kohaku had come in the room and were kneeling some feet away watching them.

Laughing nervously she remembered Jiro and Sana from earlier but laid back down at Izumis insistence.

Soon loosing herself once again to the sensation of warm, soft heat she closed her eyes furrowing her brow.

Feeling Izumi slowly enter her and copy what she had done Rin wrapped her legs around her shoulders as she felt the pleasure pool in her stomach before shooting down to satisfy her.

Yelling out she pulled on Izumis hair and ears as she helped her ride out her orgasm. Going back up her body Rin smiled at her before glancing back at their mates whom hadn't seemed to move.

"They will not interfere." Izumi said her tone taking on a possessiveness. "They know their place in our relationship."

"But we can invite them to join us, yes?" Rin asked sounding innocent.

"Of course. Is that what you want little Cho? Hm? For our mates to join us?" Izumi questioned back. Rin gave a nod and sat up looking over them both.

She rested her eyes on Sesshomaru who was as calm and as infallible as ever. Kohaku on the other hand appeared to be struggling physically.

His hands were tightly clenched on his legs and his breathing was somewhat labored. Rin looked to Izumi as if in question.

"Do you want Kohaku to join us?" Izumi questioned to affirm. Rin gave a small nod as she were asking permission.

"Rin, do you remember what we discussed when you first inquired about a physical relationship with Izumi." Sesshomaru said softly.

"That it was…alright? And there is nothing wrong with it." She said searching her memory.

"Also that it is up to the females to engage the males. As a pack we may be with one another in such a way so long as both of you agree upon it." Sesshomaru elaborated.

"I need to know that it is what you both want as well. That it's alright for the two of you." Rin said. Sesshomaru gave a small nod while Kohaku did the same.

"Come here mate." Izumi invited. Kohaku stood walking over to the futon swallowing hard. Izu stood up removing his outer robe leaning close to him. "You're shaking."

"This is, unexpected." He said with a smirk. Izumi gave a small nod of agreement before licking up his cheek. Taking off his kimono top she sat on the bed beside Rin who looked up at him with a small smile.

"Hello Kohaku." She said in her usual way.

"Hello Rin." He returned when both of them grabbed one of his wrists pulling him down onto the futon. "Am I really allowed to do this? With both of you?"

"We've known one another a long time. You are one of the few people I am most comfortable with and love, so why not?" Rin said. Leaning forward she kissed him.

Izumi watched as Kohakus eyes went wide at first before he closed them and leaned into Rin. Wrapping his arms around her he laid Rin down underneath him continuing their kiss.

Moving off of the futon Izu looked to Sesshomaru who stayed where he was when she first saw them both in the room. Going over to him she placed her hand against his cheek as he tilted his head up to meet her gaze.

Leaning down a bit she pressed her forehead to his rubbing her nose against his. Emitting a soft growl she licked his other cheek as invitation which he returned growling deeply in his chest.

Standing he began removing his armor allowing her to assist him placing it on the floor along with his swords and moko-moko. She removed his kimono and untied the sash he kept around his waist.

Sesshomaru ran his claws down her arms to her waist his eyes not leaving hers. Smirking she pushed his pants down and untied his fundoshi dropping it on the floor with the rest of his belongings.

Kicking off his boots he stepped out of the garment lowering his head to nuzzle her neck licking up to her jaw.

Taking his hand she led him to the futon where Rin had Kohaku fully undressed as well teasing his length with her hands.

Closer to the platform Izumi knelt down in front of Sesshomaru taking his hardened member into her mouth.

Growling louder as she ran her tongue along the head and underside he gripped her hair tightly entwining his fingers into her locks.

His eyes moved to his mate and his beta male as Rin encouraged Kohaku to mate her by spreading her legs and guiding him into her.

Hearing Kohaku groan as he took pleasure in his mate Sesshomaru stopped Izumis oral administrations coaxing her to turn around.

She laid half in the futon and knelt on the platform allowing him to mount her from behind. Gripping her hips he laid his body against her back thrusting until he found her entrance sheathing himself in her as far as her body would allow.

Letting out a small yelp followed by a whine he began to thrust within her drawing out before burying himself back in. Kohaku had Rins legs on his shoulders as he quickened his pace while Rin moaned out in pleasure.

Sesshomaru steadied himself by moving upright and pulling Izumi up with him. Rin watched them running her hands down to her clit to rub at it bringing on her climax.

"Yes! Oh Kohaku!" She shouted out as she gripped the bedsheets with her free hand. Taking himself out of her quickly he pumped his seed onto her pelvis and stomach coating her flesh in it.

Izumis whimpers continued as Sesshomarus pace became faster as he bounced her on his lap driving his sex harder into hers. Gasping and howling Izumi threw her head back to hit his shoulder.

Growling loudly Sesshomaru stilled to move her off of him. Bending down she took him back into her mouth sucking hard tasting the hot cum hit her tongue as he released.

When she was certain that he had finished she slowly pushed off of him swallowing down his seed. Licking her lips she stood leading him to the futon to lay down with Kohaku and Rin.

Rin had nearly already fallen asleep when they joined them with Kohaku lying behind her holding her to him.

Izumi laid next to Rin glancing at Sesshomaru who grabbed his moko-moko from the floor.

Making his way back to the futon he laid behind Izu draping the fur over them much the same way he had done the night Rin had comforted her.