Anyone have Premature ejaculation when seeing the bull dominate ?

I had my first cuckolding with my gf a couple weeks ago. I was very overwhelmed at first and did not think I was gonna go get hard. As soon I seen my girlfriend grab our bulls cock I immediately got hard. I felt so hard and horny that I had to keep smacking and holding my cock for me not cum the whole time I could barely touch it. Any one else feels like they gonna cum just by watching from the get go ?