Birthday pegging

Wife pegged me last night for my birthday. She doesn’t mind at all doing it but it’s definitely not part of our regular “menu” in the bedroom either.

Finally tried out the underwear type rather than straps hoping it would be sturdier for her when thrusting but she said she still felt like she had to hold the strap on in place with one hand while thrusting.

Any recommendations on ways to keep the dildo more secure so she doesn’t have to hold it and can just grab me with both hands?