I assume that this is for your home movie cumshot compliation?
Why not add milk and mix it with your excessively thick off white cum, place it in a squeezy bottle and attach a straw to the bottle. Then tape the straw underneath your cock using flesh coloured micropore tape so the camera can't pick it up.
You then get your gay bestie to hold the bottle and squeezie from behind (while stroking your ass no doubt) at the appropriate opportune moment.
Please remember to upload to Xhamster and link on here so we can give you marks out of 10.