Hashi and Hooru are the typical dorks you'd laugh at in school. A brother/sister duo that's always either slouched over, frumpy, sweaty, or watching anime. But, when a nonchalant jock hangs around with them enough to break them out of their shells, they take the dive and make their more desperate wants embarrassingly known.
The prompt is basically just a setup for a bisexual threesome with two nervous weirdos. Shouldn't take much pushing to get it in that direction. Edit as you please, and put these nerds in their place like the Chad (you) are.