omg yesss
like those contract marriages for a green card to help a buddy out and wow what's this the govt for some reason unrealistically is going to come check out your place and now you have to move in together

or yuggys or bams mom is pressuring them about being single so they ask the other to be their fake bf just to get her off their back

or you need a date to an exes or a family member wedding and you bring your friend or better yet hire a random to be that person

ibe read far too many fake dating fics lol