Ch.1-3, 5.5 Love is Close - His lil adopted bro (already taller, handsome & popular) loves him to the point of stealing his undies & even putting them on his head. Σ(  ̄□ ̄||) As a big bro (chibi), he'll get him on the right path. - We all know he'll definitely fail.
Astrological twins, two bros got the exact time & date of birth. Mysteriously, big bro feels lil bro's pain and lil bro shares his pleasure sensation. (O_O;)
Great! I like it, like both cool big bro and the cute lil runt bro. Big bro apologized & confessed as a real man but lil bro turned him down
Cousins
Twincest
Botan's love-filled family peacefully goes on until the kiddie-Son & Dad challenge Papa-chan on stealing his beauty-neko!! Σ( ̄∇ ̄")
Anyway, the winner of the serious confrontation of the lifelong rivals single dads is.. the Uke! HA+ ┑( ̄▽ ̄)┍ He not only earns so much money but also gives those idiotic duo lessons
story 1 (p. 3-94 + 131-159) cousins
story 2 (p.95-130) teacher x teacher
Yaizu Brothers