Please Moderators move this if it's in the wrong thread. I wrote this longish post earlier today about enemas and sex but lost it. I just found it again.
The biggest enema (small for me) I've had sex with was 2-2.5 quarts that my Domme ex gave me about 10 years ago. This was right after forcing me into a full rubber catsuit, gloves, hood, gag and rubber blindfold, cuffed wrists to ankles over my x-hi Converse sneakers over the catsuit so my couldn't extend my knees . After giving me the smallish enema, she made me hold it and exercise slightly by rolling around on the bed, including on my belly, stand up to assess my distention, and wrap me in warm blankets to be sure I was properly sweating under my rubber (remember, I was sub, she was Domme). I utterly adore sweating under rubber suits and sneakers. She had me wrapped in rubber and blankets hold my 2.5 quarts until she had properly sweated me enough to get my sneakers soaked with rubber sweat dripping don from my suit.
This was of course all preliminary to sex. After dressing and retaining and sweating and checking for my sneakers being properly sweat-wet and exercising slightly, I was laid down again still holding on my left side and belly and she made me give her oral a couple of times until she was happy and screaming (kids out for weekend). Finally, after being as satisfied as she wanted for a little while, she sat on me and fucked me while I held my 2.5 quarts and I came inside her holding. She knew my kinks (all of them) and made us lie there with me still in rubber and holding (yes, she was nice enough to put a double ballon catheter iDBC) n me before the enema) while we both had our post-orgasm naps. Ringht after waking up on each other (I must have held 2.5 quarts for a couple of hours or more by then - heaven), she offered me her usual slate of D/s "choices." I could take another bag and then go right over and evacuate, OR I could stay with my 2.5 quarts covered in rubber and sneakers and just go to sleep and wake up whenever she woke me up in the morning. Whatever she planned for the morning she wouldn't tell me yet. Realizing I felt like 30-40 but at the time was in my late 50's, I chose the quick extra enema followed by immediate evacuation.
She laid me on my back for enjoyment's sake and I looked at her red flow meter turning rapidly as she started giving me the last (I thought) enema of the evening. She didn't have to pump her Higginson as the flow was so good with only 2.5 quarts in so far (bag about 1-2 feet up) and an enema the day before. She wouldn't tell me how much I was getting in my "choice" of post-orgasm enema, as she liked me to take it and tell her how much I was getting after feeling it go in. The other little predicament was that if I guessed an amount on this last enema that was way off, she had the option of punishing me with a whole new enema series right then and there! Fortunately I've been giving myself enemas since age 15 and have a moderately good volume sense. I guessed an extra 1.5 (total 4 now) quarts and was right on. So no "punishment." She couldn't stand not fucking me again with 4 quarts, so in typical Domme tradition, a quick surprise. I got fucked again on my back holding four quarts this time. So I finally went and unzipped my suit and evacuated and cleaned up and eventually went back to bed where she was sleeping. I went a lot longer than I expected on this description of sex with 4 quarts, but hope its at least readable. I'll never forget that night for the rest of my life, not least of which because my ex invented the whole night just knowing my kinks, without telling me her plan.