Hard to see how anyone would get ‘bored’ fucking you, I could hang out of you forever and keep shooting my cum on in you..very sexy and amazing lady.. no offence intended to you both..
Anal has a whole different feel for a guy. Let Bob have your gorgeous bottom and he will love you so much you both won't believe it. Make sure you BOTH are very lubed and ask him to go slowly and be gentle. Let us know what you think. There's no need for fear. Really.