Identify Looking for doujin

[YeeYeeYeetz]

Looking for doujin I read a while ago. All I remember is that it was based around a school where students were given like blood types but for sex. The main girl freaks out when she finds out someone in their class has the same type as her.

 

[KPatch]

Sounds like Ai no Neuchi
Read this one a while back, it's NTR, but I don't remember there being a horse in this?

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If it's not those then it might be Seifu Kounin NTR Kozukuri matching

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[YeeYeeYeetz]

Yeah it was the first one thanks.
I also didn't remember the horse...interesting