I'm looking for a yaoi with a love rival. In my opinion, this is different from a love triangle. In a love triangle the third person is seriously considered by the audience as someone the protag could end up with. I want the third person to be there as an obstacle for the main couple.
Specifically, I would like the seme to have a love rival for the uke. But if this is the case, I don't want the uke to be a tsundere. I'd prefer it if the uke liked the seme first and the seme was kind of slow to fully accept the relationship or something like that. Basically, the ideal manga would be tsundere seme has a love rival for the uke who loves him first, and therefore the seme comes to realize his love for the uke by realizing that someone else might take him.
I'm sorry for asking so much, but I've been looking for something like this for ages. Of course it doesn't have to be exactly like this, but something similar.
Some manga that I've already read that are sort of like this are Tenohira no Seiza (because the seme thinks the uke's friend is his rival), Yabai Kimochi (the seme isn't tsun but he does seem frivolous, and the uke was the one who was really serious about it) and Rin! (because this seme also thinks the uke's friend is his rival. also because another rival appears later on).
Once again, thanks!

Aiso Tsukashi
Ano Hi no Kimi wo Dakishimeta nara
Calorie not sure about this

Thank you! But I've already read those. I was also looking for something a little more light-hearted.