She's 21 years old, and I go down on her while she watches BBC cuckold porn. When I'm not there she vibes and fingers herself over the porn. She's fascinated with black cock, the bigger the better (although she's only ever had my white cock. I'm on the fence, I'm very tempted to order the 'Bam' dildo as she wants to prove to herself she could take black cock, and I want to see and feel her stretched out and gaping. My question is, is the Bam Dildo too big- will it ruin her pussy for her later years in life?