This is the effect , where after you spend an extended period of time interacting with a friend with benefits otherwise known as a fuck buddy, resulting in the adoption of slight feelings towards your partner in fuckery, that threaten the nature of your strictly Mario kart playing and sexually orientated relationship.

When the “crush” has no intentions of taking things further, but they like the attention. So they flirt here or there, send dm/texts just to keep the person interested, knowing damn well they’re staying single.