An interesting approach Gia. I like the idea. To elaborate on your thought. How about Mary-Kate lying on her back across the doctor’s exam table while a busty nurse (Extreme Alex) supervises. The doctor sits on Mary-Kate’s face force feeding his manhood down her throat as the nurse holds her wrists. We all know it's not going to be easy to get Mary-Kate to swallow his thick chunky cum. I’m picturing a reverse facefuck with the Doctor’s cock plugging her mouth and his sack rubbing against her forehead. The real kicker is that the medical staff has figured out that the only way the twins will eat anything is by having them do it together. At least something gained from all those annoying videos? It’s discovered that the sisters will gladly drink any digested fluids coming out of the other twin’s cunt. I'm not sure if it’s easily doable but I picture the doctor cuming in Mary-Kate's mouth and seconds later after she swallows having her squirt the juice into her sister’s mouth. Naturally Ashley would be kneeling between Mary-Kate’s legs in this 3way food chain.
Of course we can also make sure Ashley gets a full meal by having the nurse catch any of the remaining cum off her chin into a wine glass. I think Ashley should be accustomed to drinking from those.
I believe Mary-Kate’s father was the one who eventually checked her into rehab. Wonder if daddy Olsen is standing in the adjacent room watching through the one-sided glass as his wife kneels before him sucking him off

? Perhaps he will order more doctors into the room to fill up those starving tummies.
Like the added twist? I love your idea of including Extreme Alex in this. Does that mean Ashley needs to learn how to give a round of rough blow jobs, gag and spit swap the cum into Mary-Kate's mouth?