Hello Parag Sinha.
I hope that encounter went okay and to your liking.
Those up-thread who said "
Just say no." are exactly on the mark.
Some people, especially immature people, who would ask to borrow your camera, lens, car, fountain pen, or other fine instrument simply do not understand things that are delicate, precise, and expensive to buy and keep in perfect condition. I know a lot of people who own nice things, and I would never even think of asking to borrow those fine things from them.
When I was young in this hobby I loaned a Yashica-Mat 124 TLR to a fellow at work. He returned it with the folding viewfinder damaged. Fortunately, Yashica repaired it for me for not much. Later, another fellow borrowed a Nikkor 28mm f3.5 from me, and returned it with a scratch on the glass, which removed the coating. He had put a fingerprint over the scratch, hoping I would not notice. Then, when I asked him what had happened, he denied scratching it. I know for a FACT that the glass had no scratch when loaned, because I had inspected it carefully before lending it. I learned. Never again. That was about 1968, almost fifty years ago.
Never lend a fine instrument to anyone who is not able or inclined to make it right if things go wrong.
I guess if someone asked me if they could borrow my camera, I would probably say:
"I hope you will understand, but I have a few expensive and delicate things that I simply do not lend out. My Nikon is one of them."
If the friendship cannot survive that, then you don't really have much of a friendship at risk there in the first place.
Happy Day.