Wanted to thank all of you for making me want to get into this, and especially msm-saline for his guide, helped a lot !
Thankfully got it in the first try ! Was kinda worried I'd pierced a teste protection, because my scrotum at first swelled in a strange bump, but I was able to move my teste away from the needle freely, without pain, so I just reduced the flow out of precaution, and after a while, when it started to spread, I realized it was all good ^^ And by the end of those 500ml, I'm not even that tight (I didn't tie up, didn't want too much pressure, but I don't think it migrated that much, didn't even go into my cock). But I thought 500ml was enough for a first try xD It feels so awesome
I loooove it ! Looking forward to put a lot more inside of me 
- 500ml of saline - first try ever !
- Standing this time - love how it rubs against my thighs !