#this is one of the best polin fics out there yall
Grown Up Love - Nevermore_red - Bridgerton (TV) [Archive of Our Own]
After seeing the viscount and viscountess in a rather…intimate moment, Penelope realizes there is more to grown up love than her sweet fantasies. There is something needier, something more passionate. A passion that rivals the love she feels for Colin Bridgerton.