>>42490581 (OP)
Do the nice mares in question consent to it?
If something, anything, prevents the mares from upholding their side of the deal, do they get punished for it or only I do?
What if I'm in the middle of some dangerous adventure and can't afford it to happen? Imagine a dungeon where I'll get eaten by monsters if I ever let my guard down so I'm speedrunning it through a week on hard stimulants without a single nap; should I still take the mare with me (imagine a beefy scarred merc mare in a badass riveted attire) and let her tuck me in every day to formally heed the deal?
What if I'm alone on a space station where everybody else is cryofrozen and if I tap the big red emergency thaw button on anypony's cryopod this somepony would get sick or die later, would I get magically yeeted from Equestria during the next tucking in deadline if I refuse to risk it or would a new mare just magically emerge from shadows to tuck me in? In the latter case, what am I supposed to do with the magical shadow mare? Is it my right and responsibility to take care of her for the rest of her life or would I have to adopt her through standard bureaucratic procedures?
What if I was playing with forbidden magic and accidentally got myself temporarily incorporeal so blankets just pass right through me?
What if some mares abuse it? For instance, can a vampire mare coerce me to let her into my house because it's her turn to tuck me in?