She is gorgeous but does need training to produce more cum when she orgasms. I use sessions of edging for many hours to help the sperm build up before allowing ejaculation. I also find the use of chastity devices works wonders when self masturbation is restricted.
Last time I fucked a dick that big it took a hour to stretch my hole out so he could thrust normally. Right before he shot his load, I did my trick. I told him to stop and hold his cock deep in my ass.When he did that I squeezed and released his cock a few time then he popped off deep in my ass