LOL i know right? The ass just magically lubricates itself. HAHAHA but it's fiction so... yeah.
Who in the world would take sexual reference from manga. The characters aren't even real. It's way better to do research from books, interent, asking questions or I would at times ask my own doctor but never unreal characters. You can't even trust porn. Reseach or ask questions because you will get realistic answers. I also feel fear for them cuz that's a tramatic experience waiting to happen.(⊙…⊙ )
I have one friend who, after reading some manga with a lot of smut (not yaoi but still), bragged how she knows a lot about sex even though she's a virgin (we're 'kinda' close friends at that time, till real colors came out). That's why I feel bad for those who make manga a reference. xD
P.S. I've been binge watching Joey Graceffa's vlogs for 3 days now, so as I was typing this reply, in my head, I use how he speaks and his voice when it's like a sassy bitch. xD
http://www.mangago.me/read-manga/happy_end_o_shinjiteru/
It's been two years since your reply... but I just read this story and well. It perfectly answers your question of who in the world. xD
The one thing I don't like about some female and straight male authors who writes Yaoi sex scenes, they make it seem like it doesn't hurt, some yaoi I've read that is.
Like punching a person would hurt less than tops just shoving it immediately. First entry always hurts, sometimes they even have to take it out to and try again with more lube. Unless you're a power bottom who do it 3 times a day or if you stick in dildos with sizes in ascending order, then that's gonna still hurt.
And DP for a virgin? That's like shoving a 2liter bottle of coke and that's fricking painful (Don't ask how I knew) without excessive amounts of lube and 30mins of intense preparation(lots of articles for those who want to know) and no, asses don't generate their own natural fluids by themselves (Advocate. com will tell you all about it and the uses of lube) , it's not a vagina.