Situationship to Relationship

This was the one that started my love for this trope!
Hajime Shinohara hires a callboy in order to lose his virginity. The callboy, Ryota, turns out to be a student studying at the same university as Hajime!
It's really sweet how they slowly fall in love with each other as their lives gradually intertwine.

This one is about Kei, a college student who visits a crossdresser massage parlor. There he meets Nana, who helps him overcome his terrible experience of being groped on a train. They slowly begin a sexual relationship, but it takes a while before they become offical.

Sex friends to lovers
This one is very sweet but the mangaka is also known to have the dumbest sense of humour ever so don't be surprised when the most out of pocket thing happens

I feel like their situation is a little too complicated to be categorized as a "situationship," but I mean to call it what it is, they weren't officially dating.

This is a oneshot, but a very nice read!

This is a slowburn, but I just love how they slowly build their lives around each other. This manhwa relies heavily on miscommunication to drive the plot forward, however, so watch out for that if it's not your cup of tea

Both the main couple and the side couple are sex partners --> lovers.

Everyone in this manhwa is a different kind of crazy, but I guess that means they cancel out