Couldn't think of a good subreddit, but Open Up seems like a

You couldn't believe she would do this

Sister got some new moves

And you couldn't wish for more

Couldn’t resist his GF

Watching My Husband Crumble Was Too Pathetic To Bare...

you couldn’t figure out why your wife’s lips taste different

I couldn't believe how well my son performed

My hotwife origin story couldn't have been better

She tried but couldn’t resist

My GF had an offer she couldn't refuse from her landlord ...

You couldn’t imagine this happening