Fluff

Used in many fanfictions as a sign of cute relationships happening. It is when two characters (more if wanted) do things a normal couple would do in their daily life, love each other and show affections by kissing each other, nose, cheek, or mouth, putting their arm around their partner(s), and/or be doing activities together that may end up with the characters enjoying a cute moment together such as kissing.

"Aw, that fluff was adorable! It got so cute when *insert name* kissed *insert name* and confessed his/her love!"