Eating cum again

Axel our black friend, who had been my wife’s boyfriend before me, has great sensibility in his glans area. My wife Susie realized about this in one occasion, wich Axel had cummed and Susie, needing reach her orgasm, immediately gave him a blow job, making his cock turned hard again, despite he was in his refractory period. Axel fucked her anew and not only made her cum but also he cummed one more time.
Since that day, Susie ever sucks Axel’s cock when they are going to have sex. Sometimes she even has sucked his cock despite it was hard enough to fuck, because she loves Axel’s cock.
Recently she ate his cum during a blow job. She had eaten his sperm once, during another blow job on a car travel in the past.
It was something that she doesn’t use to do. Susie sucked Axel’s cock softly even biting his balls too. At least three times she stopped the suck to ask him if he was close to cum. The last time she oppened her mouth and received Axel’s cum squirt.