I had my first son a couple of years ago now. My husband has always loved my breasts but he took an even bigger interest when they swelled with pregnancy for breastfeeding. I noticed that if I breastfed Evan while he was around, he'd be trying to hide an erection within minutes, and eventually he'd leave the room and go and masturbate somewhere.
One night, this progressed when he got up to leave and jerk off. 'You don't have to leave you know,' I told him. He looked surprised. 'If you want to watch me while you masturbate that's fine.' He eagerly took his hard cock out, telling me how much he loved me and what a great wife I was, and he came in about five minutes while watching me breastfeed. This became a routine.
I knew what he really wanted, and that was to try it for himself, but I wasn't sure if I was comfortable with the idea. One night though, I was a little horny and when he began to play with himself, I did too. Not wanting to do this with Evan around, I put him in his crib and came back. 'I guess it's your turn,' I told him. He looked up, surprised.
'For a suckle'
'Really?' I could see his cock stiffening even more at the thought. I nodded and he eagerly came and lay across my lap. I cradled him like I do with our son and he latched onto my left nipple, taking a few tentative sucks. I moaned and he did the same in response, and immediately began to suckle. His grip was far stronger than the baby's and deeply arousing. However his arousal far outweighed mine because he'd only been sucking for about 15 seconds when he tensed and begun to shoot cum all over his chest and mine.
We began to do this every night and his tolerance gradually built up. At first, he was exploding in seconds; such a turn on he found it, but now, 18 months later (my son is long weaned, but) my husband still nurses every night. I can masturbate myself to orgasm but he still doesn't even have to touch himself. If he does, he comes immediately while he suckles and we usually come together after about 15 minutes.
It's an immensely bonding experience and we've never been closer. I highly recommend trying it with your hubbies!