My wife was always super-horny when she was pregnant. One one occasion a young guy from my work had stopped by the house while out biking. She had no idea we had company and walked out into the living room in just her robe, which was untied, nothing on underneath. When she saw him she was very embarrassed, and covered up , but he complimented her on her preggo sexiness, put her at ease enough so that she willingly undid her robe again and let it gap open. She was about 8 month along and already lactating.
With some coaxing, she stood in front of him and let him fondle her milky tits, which then began to leak. He surprised her by suckling her milk, first one breast, then the other. She was breathing hard and quite excited, and I saw him slip his hand into her robe and begin fondling her pussy. At that point she moaned quite loudly and I saw her hips bucking and legs trembling.
She protested weakly when he slipped her robe off, but we all knew she didn't mean it. She got down on her hands and knees and he entered her from behind and began thrusting. She had a strong orgasm after barely a minute of fucking, then a second a few minutes later before her blew a big load in her pregnant pussy.