God I love cyber!Rui with tentacles (Thanks Shii, brain changed forever). His face not showing any emotion when his tentacles start touching on Tsukasa's legs, making the blonde squirm and blush but not doing anything to fight them. Tsukasa just letting them touch his thighs and separate his legs while Rui is just… standing there with his hands on his pocket and showing no desire for Tsukasa. But oh if Tsukasa could read minds, he would see how Rui is way too excited to fill him until his stomach is deformed. Tsukasa already weak from having his nipples played with, only standing because Rui's strong hands keep him pressed against the wall. He can't realize when they change position, Rui's tentacles moving him until he is sitting on Rui's tentacle cock. It feels so strange but so good, it fills him so deep and it keeps touching all the parts that make him weak. The slimy skin feels so strange against his insides, becoming warmer and taking Rui's shape until his stomach is round, trying to fit Rui inside...