Make a sandwich first but pass on the mayonnaise, then when you're fapping stare at the mayo-free sandwich. Your snake will begin thinking "Oh deary me! That sandwich doesn't have any mayo! I must help the poor thing somehow!" And begin shooting jizz everywhere, focusing especially on the sandwich. Once the sandwich is completely full of semen your snake will feel relaxed. Begin eating the sandwich while gently stroking your snake, this will show that you are grateful to your snake for putting mayo on your sandwich and rewarding it with pleasure.
And this is why I talk to you on steam
You have very, interesting, stuff to say.