Responses

I guess it depends on how you interpret that.
When I read it got the impression that he was still just joking because Ishikawa never openly expresses his love. Honestly, I feel like Yamaguichi only wanted to give Ishi a sense of how he feels. Ishi's always telling Yama how their just friends with benefits and pushing him away; I believe Yama and Ishi's sister only want to be friends and allies, nothing more.
i love the art. but honestly the problem is, when the seme said he would "reconsider" dating the uke's sister is just cruel. if you love someone, and you're thinking of banging her sibling then you're a bastard. i doubt the seme's loyalty and all his "i love you" shit. (︶︿︶) damn, im irritated every time i remember he said okay when the uke's sister ask him to going out for real.