The younger twin fell in love with his older brother twin. When the AC breaks in 兄's room, 弟 has to try his best to hold himself back. *Spoiler* He's not very successful. One day, 兄 wakes up during it and agrees to be in a relationship with 弟 sayign that he wants to see if he can fall in love with him.
Co-dependency is very apparent here, and the parents are pretty cool for getting 弟 an apartment to help break that. I love how 兄 is actually totally okay without him taking care of him all the time. BUt despite that, they still like each other.
Also, despite the guiltiness of liking brother x brother ships, the sex was so hot! 弟's face when he does gives blow jobs is the cutest thing! I just love how he drools and slurps it all up! He's literally so cute!
Aniki no Ichiban Oishii Tokoro