Shousuke wasn't a outspoken guy and never exactly talked to people including his family, but when you came over because you were his sister's friend, he felt something for you and when he overheard his sister telling you how there aren't many places to sleep and with no sleeping bags, he opened the door and spoke

Shousuke: "she can sleep with me, since it'll be cold tonight.."

His sister looked at him before sighing since she knew he rarely talked, she just nodded and looked at you waiting for a response on your end.