I can mentor you but it is a suck it and see sort of experience,how keen is your wife,spend lots of time playing with her,the more stimulation the more they want.
We want the same thing. Lick his balls, shaft, suck on the fat white head...INSERT IT with face only inches away...while licking her lips and clit (his thick, long cock as well)...and watching her accept every inch...until FINALLY her tender CERVIX gets bumped. Then the pumping begins with my kisses and licks until he explodes deep within her. He withdraws...and my lips and tongue make SURE no juice is wasted.