my new homers doesnt want to sit on their egg!

[sinister357]

my new homers decided to lay an egg last night but this morning, i checked, and they haven't been sitting on the egg. its cold. is that going to be a problem??? my other pair sits on the egg imediately but not this one. is there a possiblilty thery are waiting for the seccond egg to be laid before incubating them? help please because this is my matching pair of reds which would make alwesome ofspring colors. i hope they breed.