Oof. I'd suggest breaking up a lot of your run-on sentences and using more full-stops. Internal dialogue shouldn't be in angle brackets. Cup Cake's dialogue about picking up pills is a little forced. You have some odd sentence constructions too, like the closing line.

Rest of it is great though. Great sensory descriptions. Good use of kid terms to describe Pound's limited perspective/knowledge.

yes Pound, go ask your parents about it.

I can only imagine how that conversation is gonna go!

OH SWEET JESUS XD

Ok so, before even reading the chapter. I'm on my iPad, right? So I have to copy and paste spoilers into my search bar to read them. This time, though, I decided to have my iPad read it for me.

Everything was fine until it got to the end of the spoiler.

It read cumshot as, and I quote, "cumshit"

I burst out laughing XD

What SPECIFICALLY were the pills supposed to be?

7894009 Herb-based emergency contraceptive (otherwise known as 'morning-after') pills, that work by inhibiting ovulation or fertilisation.

In the type used by humans, such pills tend to contain higher doses of the same hormones as found in regular contraceptive pills, in order to have a higher chance of eliminating pregnancy. Since we don't have sapient equines with wings and/or horns in our world, we don't know the exact hormone build-up, but a veterinarian or a horse rancher would likely know how to prevent a real-world mare's pregnancy. I am neither, and thus cannot detail how that would occur.
Cup Cake may or may not have had contraceptive pills (judging by the fact that she was considering keeping the foal/s, likely not), but the morning-after pills would, in all likelihood, prevent that.

That great feeling of satisfaction.

7970501
nice profile pic

I like so far I can't wait to see what happens next.

"Pink insided something" hah. Oh boy. I was pratically rolling on the ground after that

9325903
make sure to roll on some dough next time. It would perfectly flatten it.

Nice chapter Everyones first experiences go more or less that way. Well done.