>>6505512The space at the end of the canal is a bit bigger, so they tend to rest in there. But yeah, folding/tucking, or just wearing a tight pair of underwear will keep them in place just fine.
You might find that they start to ache after a little while (sort of a dull pain) - if so, just untuck until next time. It gets a lot easier over time; and can actually feel pretty nice.
Y'all might want to look up muffing- basically it's just your partner fingering your inguinal canals, and it feels pretty nice. A couple times I've experimented with bullet vibes up in there, but haven't found quite the right method yet.