Mindblowing Fantasies

Very happy and mainly satisfied senior married man with a lovely wife. Have no attraction to men at all but do find myself awfully curious when my wife sucks me, which is quite often. Find myself wondering what it would be like to feel a cock grow hard and begin to leak, then throb and pulse and reward my efforts with a creamy reward.
Don't really see myself acting on it especially in respect for my wife and wanting to keep her safe from any potential health risks of stranger sex, but have found myself wanking to thoughts of sucking cock.