Basically poly ruinenekasa and u Rp as any

One night Rui‚nene and Tsukasa was sleeping together Nene was cuddling Rui but Tsukasa wouldnt let that slide so he tries to get Nene away from Rui and succeeds. After that Tsukasa cuddles Rui himself. Nene gets upset and tries to get to Rui but Tsukasa pushes her off

Tsukasa:"Mine."