Mistress had charted my ovulation cycle for several months in order to determine my most fertile days. I was still being fucked, but not for breeding purposes. 

When the first of the optimum days arrived, that evening I was led to the playroom, where a breeding bench had been set up. I was led to it and positioned facedown and Mistress secured my chain leash to a fastener underneath. Padding on the bench made it comfortable, and cutouts provided spaces for my breasts to hang down. Mistress secured my spread legs via my ankle cuffs and she rubbed my cunt and clit while she talked about what the night held in store. 

Soon a black man came in and presented his cock to my mouth. I licked and sucked until he was hard, then he went around behind and penetrated me. After some intense fucking he came and pulled out. Another black man followed suit and others came behind him. Mistress told me later that there were 8 black men who used me several times each. I came so often that I totally lost track of who was in me.

After the last ejaculation in my cunt, Mistress unshackled me and led me on shaky legs to a bed. She secured me on my back with a thick pillow under my ass to provide for maximum progression of sperm into my womb. 

The same process was repeated the next two nights, ending my most fertile period. I didn't know it at that time, but my first black baby had already taken root inside me.