It's a oneshot, but it's in a collection I think.

Basically the uke comes into the seme's home and breaks up with him then leaves, and the seme has a flashback of when they first met: both were about to buy the same book.
The seme chases the uke and discovers that he hasn't left from the front of his condo/apartment.
He says he couldn't take a step and only decided to break up with him to appease his parents and his work place.
They stay together in the end.