The best Rom Com that left me laughing for so long recently would have to be Kaguya Wants to Be Confessed to! Seriously it is hilarious! We Can't Learn is pretty good and ReLife is AMAZING!
Bokutachi wa Benkyou ga Dekinai 5-toubun no Hanayome ohhh... this has more than 2 heroines, they're fun anyways
Zannen Jokanbu Black General-san Chapter - if you're looking for the laughs Grand Blue Tomo-Chan Wa Onnanoko! Bokutachi Wa Benkyou Ga Dekinai - all of the heroines are adorable Senryuu Shoujo
I only recognise GB and Tomo-chan but if the rest are like that then you sir are the MVP of this thread.