guyz...

Assuming lover boy behavior means attentive and caring::
https://www.mangago.zone/read-manga/one_summer_day/
https://www.mangago.zone/read-manga/unsleep/ (peak lover boy)
Spoilers on these two below:
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In one summer day, seme protects ukes head during a sexy time at the cost of injuring his own hand, and this injury is shown a few times. He also feeds and takes care of him, massaged his feet. Hes a good guy and morally upright and the only time he is not is for the uke

In Unsleep seme protects ukes head on two occasions, one of them subtle and easily missed, massaged his feet when he tripped, bought him underwear when uke off handedly said he owes him underwear, cooks for him, builds him a bed in raws, the only thing he asks from uke as noted by uke is still related to something the uke asked to do tgt. PEAK lover boy

https://www.mangago.zone/read-manga/zero_day_attact/
Just finished reading this... This is one of those stories where you'll want to have the Top for yourself I RARELY want fictional characters too lmaoooooo!
He's just tooooooo gooooood hahaha