One evening, Kyousuke had suggested that he and Rin take a bath together. The suggestion had come completely out of the blue and left her flummoxed, but after getting over the initial awkwardness and giving it some thought, Rin had decided to go ahead with it.
Even in all the time they had been dating, this was the first time they had gone into the bathroom together like this. After showering and soaping each other, the two of them slipped into the bath, relishing the feeling of the hot water on their skin.
Kyousuke embraced Rin from behind, wrapping his arms around her slender frame in a firm hold. Their bodies pressed together, flesh rubbing against flesh. Kyousuke mashed his lips against the crook of Rin's neck, kissing her soft skin. One hand crept up to her chest, cupping the bottom of one of her small, round breasts.
A moan issued from Rin's throat and she closed her eyes, her mouth curving in a smile.
"It feels good, doesn't it?"
"Yeah." Rin's lips parted to let out a sigh and she tipped her head back, letting her body go limp as she sagged against Kyousuke. The two siblings remained embracing, basking in the steam and the radiant warmth of each other's bodies.