Relax, use plenty of lube, get very warmed up before you even try penetration, use the dildo out of the harness the first few times, laugh a lot, keep practising!
One day you can work up to this…
And stretchhhhh…
James, my boyfriend is trans so I bought us a strap on that we can use, but the problem is the dildo, which is beginner size won’t fit in me! Do you have any advice for a denial slut like me who needs to be able to take something larger than I’m used to?