Take her!

You slowly and quietly undress until you're naked. Then you wait until Rumi finish showering the soap off her body and is about to enter the bathtub when you spring into action. You open the door, shove her onto the bathtub, pushing her into a position that she is down on her knees with her hands holding on to the side of the bathtub.

"Who?" Rumi managed to utter

"It's me," you reply as you hold her hips and line up your cock near her entrance.

"Kira?!"

"Yes," Before she can say anything else, you push your dick into her entrance, eliciting a gasp from her at your intrusion.

Rumi tries to struggle but for every movement she makes, you match it by thrusting into her, holding onto her hips to keep both of you steady.

"Rumi-san," you groan as you thrust into her over and over, excited over the union between the two of you. Even though it is unbidden, her inner core lubricates your every stroke, making it smoother and smoother. Along the way, Rumi stopped trying to fight you off her, probably realizing that it's too late to do so. In fact, her body movement seems to match your thrusting, as the sounds of your breeding echoes intermixed with your calling out her name echo in the bathroom.

Eventually, you feel that you're reaching the telltale sign of climax and your thrust become longer and slower as you try to prolong the sensation of coupling with Rumi as long as you can. The moment arrives inevitably.