Really nice how his handsome massive balls are so visibly reactive to his ejaculating: just as his penis starts to spurt at 5:03, the shadow-outlined groove between his two heavily-filled testicles disappears as his balls move forward in his scrotum-bag --- so far forwards that they actually press against his penis-base-encircling pinky, in fact --- in preparation for his lusty orgasm, plus the muscular bag itself tightens upwards around the testicles, and then his big shapely nuts stay drawn up in and his scrotum remains more taut and compact during the rest of the video. Probably when his orgasm-exhausted penis eventually goes limp and his fatigued balls sag back down again sometime after the ejaculation is complete, his testicles will gradually relax and droop and descend back downwards inside their loosening bag till they are dangling freely as they were earlier, and then slowly begin to replenish their reserve of sperm so that he'll be able to copiously spurt from his desire-swollen penis again in response to his girlfriend's tenderly massaging his cock a while later when she makes love to him the next time.