Renting a Skin with the New Loot System

Hey guys the name's Murgurth and I've been playing League for the past 5 years or so. I figured I'd pitch in with the new Hextech Loot System Riot just added to the League Client. I think it's actually pretty cool they're giving us a way to obtain skins and such for free by playing the game. Although the one issue I have is that the in-game client didn't really specify the finer details of renting a skin. I had thought that maybe the after the rental period you would have the option to permanently unlock the skin and after checking online because I was curious I was kind of bummed to not see any note of that. So I actually got a pretty cool skin, Bloodmoon Yasuo and I just wanted to try out the skin and then perhaps unlock it. I was just going try it out after a game or two and see if it was worth unlocking. Perhaps this could be an option? I mean I definitely have the essence still, you could probably just bump up the required essence after the renting process. I don't necessarily expect a re-do on my renting, even though I would definitely want one, it was a mistake on my part. But I would definitely wish to keep the Bloodmoon Yasuo skin. I wouldn't mind handing over more essence, I've just already bought a lot of RP this past Holiday season and would just rather not deal any more money at the moment. Anyway I hope I can get some input on this if possible. I'm still glad we got this new system. Just wish the In-Game Client was a bit more specific on the renting part. See you guys on the Rift!

If unlocking the skin after renting it is already an option I obviously didn't know given my current post. If so, feel free to ignore the post.