I have been playing with my nipple piercings even before I bought those two, so I was wondering if I can fit a single ring through both nipples. So I tried it and it worked

Ouch. It was fun, but there was a whole lot of tension. Would it rip if I tried to straighten my shoulders, I don't know. Is there some early warning before it happens, other than, obviously, the pain gradually growing with the force that is pulling on the nipple? What does it take to lift 55 lbs like the Great Nippulini or 70+ lbs like Baron of the Universe?
Opening the ring was also kinda funny, even with those big pliers that handle up to 8 mm wires. My palms were sweating and it was hard to fit it in and squeeze it hard enough while keeping the nipples close to each other with my other hand.