Mary's dark plan somehow involves using the baby to blackmail or just drive Sherlock insane or anything else of your choice. Perhaps, the child is to be used to burn Sherlock's heart out: Moriarty's dark legacy. Just a plain destruction of Sherlock Holmes' soul with no practical purpose.
Sherlock is either an Omega (if it's an A/B/O AU) or a carrier (if it's a MPreg AU). Some time earlier, maybe before he even met John, he donated his eggs (maybe it was for a case when he had to infiltrate some sort of a reproduction health facility). Mary takes possession of them and (with someone's help, I imagine. Maybe deceiving a doctor) gets them fertilised with John's sperm before the fertilised egg gets implanted into her womb.
If Sherlock is an Omega, when the child is born, he can't find peace, because the child smells like something that belongs to him. Omegas are known for losing health, mental and/or physical when separated from their baby. And this is what starts happening. Mary deliberately doesn't let him touch the baby, but likes to be close enough for Sherlock to see, hear and smell his child.
Or, if it's not an A/B/O, something else happens, such as Mary letting him know the baby is his before taking her away for good and disappearing/selling the baby to a human trafficking ring, or anything else you come up with. Maybe it's all done to get to Mycroft through Sherlock, like Magnussen intended to do. IDK.
Good ending would be nice, but isn't necessary at all. A lot of angst is welcome, just as unrequited or pre- John/Sherlock.
If John isn't robbed of his doctor and soldier skills and strong personality, I will love you forever.
Mary's baby is actually Sherlock and John's. A/B/O (?). Possible harm to a child. Dark. Angst.
Sherlock is either an Omega (if it's an A/B/O AU) or a carrier (if it's a MPreg AU). Some time earlier, maybe before he even met John, he donated his eggs (maybe it was for a case when he had to infiltrate some sort of a reproduction health facility). Mary takes possession of them and (with someone's help, I imagine. Maybe deceiving a doctor) gets them fertilised with John's sperm before the fertilised egg gets implanted into her womb.
If Sherlock is an Omega, when the child is born, he can't find peace, because the child smells like something that belongs to him. Omegas are known for losing health, mental and/or physical when separated from their baby. And this is what starts happening. Mary deliberately doesn't let him touch the baby, but likes to be close enough for Sherlock to see, hear and smell his child.
Or, if it's not an A/B/O, something else happens, such as Mary letting him know the baby is his before taking her away for good and disappearing/selling the baby to a human trafficking ring, or anything else you come up with. Maybe it's all done to get to Mycroft through Sherlock, like Magnussen intended to do. IDK.
Good ending would be nice, but isn't necessary at all. A lot of angst is welcome, just as unrequited or pre- John/Sherlock.
If John isn't robbed of his doctor and soldier skills and strong personality, I will love you forever.