Lol yacchan is so jealous that his cousin is with toono all the time and he wants to be with him as well (because it seems that's he "romantically" likes toono and just figured this emotion out) as stated that his cousin takes everything he wants away from him and I think that that thing he wants now is toono. Let's just hope that's it's not incest though from the last scene, but it looks like the manga is leaning toward toono and yacchan to he together and they become to the story couple.
Lol yacchan is so jealous that his cousin is with toono all the time and he wants to be with him as well (because it seems that's he "romantically" likes toono and just figured this emotion out) as stated that his cousin takes everything he wants away from him and I think that that thing he wants now is toono. Let's just hope that's it's not incest though from the last scene, but it looks like the manga is leaning toward toono and yacchan to he together and they become to the story couple.