If both times the blood in semen appeared after oral sex, the possible reason might be the way you performed it.
However, this can happen in younger man often and usually is not something serious and is self limiting.
He may think about certain symptoms that can be related to urination process (like burning urination, frequent urination), that can indicate urethra inflammation due to infection.
Urethral infection known as urethritis can be reason for blood in semen.

Was the blood light red/pink or dark red?

he is 35yrs,It was light red it wasnt in the semen it just came from the hole when he cleaning up he said it still hurts n I cant touch him der,he wont talk about it n ive even said im on strike if it still hurts n untill he goes to doctor 2 cheak it out so now he is telling me its ok when i know its not.we just have to keep an eye on it. tanx