Satish,
It seems you are keen to spend some time in the Police Lock-up. What you are thinking is a criminal offence (but of course your erect cock does not know this). Stop thinking with your cock and start thinking with your head.
Don’t worry about your Aunt not getting Sex. If she needs it, she will give you hints and you will not have to resort to sleeping Pills.
By the way, who has advised that you should take sleeping pills for your headache? Please change your Doctor, if he has done so. Sleeping Pills work differently for different people and an overdose will require hospital admission.
Women will feel sore in their vagina, if there is penetration without lubrication and they will also know when semen is flowing from their vagina. If a police complaint is made of rape (assuming she does not know who it was), they will have a semen analysis done of all suspects (and you would be head of that list) so you can imagine the consequences.
Stick to masturbation and Fantasy. This will not put you in the Lock-up.