A few months ago with the express permission and strong encouragement of her new husband---my very handsome and athletic young Afro-American best buddy and only male lover of the last 6 years---in a series of beautifully long fucks with him lying beside us and caressing and lovingly licking my thrusting cock, I impregnated my ex-wife on their marriage bed so that she can bear a much-desired all-white baby to complement the three mixed-race children that my buddy has fathered for her over the last 4 years. Since then my ex's libido has skyrocketed such that I and my buddy have been hard put to fully satisfy her in our regular threesomes. However, over the last two weeks I have been woken during the nights and early mornings by my buddy fucking my ex---every time in the missionary position---for much longer and more vigorously than he ever has, at least in my presence, and obviously satisfying her very deeply and long-lastingly which at present, despite my being able to maintain very solid erections, I am unable to. His vastly superior potency and studly sexual attractiveness with my ex is now unexpectedly making me extremely jealous and, with him being a superb stayer, enviably huge-cocked and an extremely vigorous and deep thruster in sex with her, I am very concerned for the safety of the baby---from trauma-induced early miscarriage in particular. I am doubly worried now because during their fucking and especially after my ex orgasms super-strongly with my buddy, her baby-filled womb undergoes obviously painful tightenings that after particulalrly long and vigorous fucks are now showing very clearly through her belly wall and often last for hours. I have tried to intervene by offering myself as her alternative gentler fuck-partner for a few weeks until things settle down and the baby is somewhat safer from the savage thrusting that my buddy invariably executes when he is building to his orgasms which have recently become recklessly multiple and uncontrollably convulsive in a single encounter without him even once withdrawing his cock---as if he is jealous that I have impregnated his wife and he is trying to fuck my baby right out of her. But with him now being my ex’s husband and her greatly preferred lover my pleadings are falling on deaf ears---including, of course, his. I am now extremely anxious. What to do?