Responses
I only know of a similar story: he didn't get a boner but was horny all the time and said that he "ejaculated looking at a cat's ass"...
Here is the link if you're interested:
http://www.mangago.zone/read-manga/kareshi_glamorous/
The abstinence phase was in chapter 2
Help looking for a manga i read a long time ago. they were a couple in high school who used to switch seme and uke. all i remember is that they had an abstenance agreement and one of them kept getting a bonner randomly and the other partner said "you could get a bonner looking at a chicken". i thought it was funny and just happen to remember. if anyone could help it would be great