the side couple on Double Trap! it's the bottom's first time bottoming and pretty sure it was seme's first time as well. they're quite having a hard time at first, but they eventually got hang of it. its in chapter 56-59 or something.
Both 1st time:
Omega Complex
Full Moon Alchemist
Bad friends
December
Puppy love https://www.mangago.zone/read-manga/puppy_love_2/
Love percentage
Yasashii Pantsu no Nugasekata
Dawn of the dragon (1st life)
The Rogue Prince Is Secretly an Omega
Why Are You So Kind To Everyone Except Me?
1 1st time, there's plenty:
Nerd project
Jinx
Third ending
...
looking for ones where both characters discover sex together (if that makes sense) or like it’s their first time having sex (or at least one of the character’s first time) and preferably not too long, also that doesn’t have to be the main plot i just want it to be involved somehow
THANKS IN ADVANCE !!!