It didn't seem fair to me that only one cute sister gets to have all the fun.

[ He slides behind her, placing a hand gently on her shoulder. In front of them, Hideyo slowly pulls out partway of Mion, then slides back in a little deeper, a hand reaching around between her legs to lightly tease her clit.

Pressing his hips against Shion's bottom, Keiichi then leans in to murmur into her ear. She'll no doubt feel the hard swell of an erection against her, but he takes care not to rub it too aggressively against her. ]

There's another cute sister who deserves to feel good, isn't there? I'd like you to join in, Shion. And I think you'd like to do that, too.

[ His other hand, meanwhile, rests on her lower thigh, wandering beneath her skirt. ]