"Any Kindred, regardless of Willpower, may make a Self-Control roll (difficulty 8)to avoid succumbing to the Kiss. This enables victims of Diablerie to have a chance of fighting back." (pgs. 139-140, VtM Core Rulebook, Revised) Don't know about VtR, or the V20 rules, but I'll bet they have a similar rule.
Bloodlines won't allow you to feed on Kindred, period.
Most humans cannot resist the effects of the 'Kiss' unless they are "Exceptionally strong-willed" (9+ Willpower), and even then it is only for a short time, before they succumb to the pleasure.
Unless you're Giovanni, or have the 4-point flaw 'Grip of the Damned'. Then your Kiss is not pleasurable, it's painful.