You're getting married to Aoife and one thing you like best about her is her ass, who doesn't? You think it's time you and her take part in some backdoor banging. She's very reluctant but you insist until she finally agrees. Just go at it. Bang her ass even if it looks like she's in pain. Hurry up, get it over with. You'll be paying for for her fantasy wedding and she will probably remind you of this the rest of your life, so you better enjoy it.