I am so sorry if this description is vague but that is due to the fact that I am not able to remember what the main story is about and am only able to describe the side story which is what I am interested in finding. This description should come from the couple that is in the last few chapters of the volume that I am looking for.

The plot that I can remember is that this side couple have been friends since forever and have been fooling around with each other for a long time but since they grew up and are now in either high school or middle school the uke has been reluctant to have sex with the seme since he has gone through a growth spurt and is now taller than the seme. The seme does not know what to do so he asks his older brother (who by the way is the uke of the main couple of the manga and has a brothers complex about his younger brother). In the end, the seme finally confronts the uke and why he won't have sex and they decide to switch roles in the bedroom (so now the uke is the seme and the seme is the uke) and that solves their no sex problem.

Please help me find it. I have been looking for it for 2 days now and am starting to go nuts that I can't seem to find it by myself. All help is greatly appreciated.

Tsuyogari chapter 5 and extra or you could go through this list.

OMG zephyr4 thank you so much. This is the manga that I have been looking for.