I love to look at pictures of a guys cock with gobs of cum all over it. I also like to see cocks in condoms, and comdoms with cum in them. There, that should get you going.
Once when I was younger, a guy did me with a condom on and after he left, I found the condom in the basket and took a pin and pricked the end of it and sucked all the cum out of it. The taste was interesting, but the feeling was so naughty as I masturbated as I did it. I had a wonderful orgasm as I did it.
I kept that condom around several days afterwards, and every time I masturbated, I would suck on it.