D had a miscarriage, I know not the best opening line, but it sets up what ensues.
When she got pregnant the second time she was pretty much confined to bed. Very little exercise or anything. Except sex. As she got bigger I was a tad worried about hurting her, but I needn't worried. I'd start eating her pussy and she say shove your damn cock in me. She'd be laying on the couch watching TV and I'd come bend over to kiss her and start undoing my pants and giving me her 'fuck me' smile. Sometimes she'd suck on me but mostly it was get that cock in me.
That was the first pregnancy. The second one not so much. After finding out she was pregnant that was it . Basically no sex the entire time except an occasional BJ. Then one evening just before due date she said fuck my ass. I admit I was a tad stunned, after several months of near nothing she demands I fuck her ass. I was one happy camper that evening.