Puck follows a whimsical summer day of passion between the open-hearted American Mac and the mystical English Northerner David. During Mac’s London travels, they meet for a simple hook-up, but their chemical connection boils more romance to the surface than expected. Root beer floats and living room kisses lead to heartfelt conversations, but feelings are kept withheld under the boundaries of David having a fiancée. His open relationship allows for strictly casual sex, but how will the two navigate their immediate bond as their paths collide?