Define.

ir·re·sist·i·ble
   –adjective
1.not resistible; incapable of being resisted or withstood: an irresistible impulse.
2.lovable, esp. calling forth feelings of protective love: an irresistible puppy.
3.enticing; tempting to possess: an irresistible necklace.

pas·sion
–noun
1.any powerful or compelling emotion or feeling, as love or hate.
2.strong amorous feeling or desire; love; ardor.
4.an instance or experience of strong love or sexual desire.
5.a person toward whom one feels strong love or sexual desire.
6.a strong or extravagant fondness, enthusiasm, or desire for anything: a passion for music.
7.the object of such a fondness or desire: Accuracy became a passion with him.
8.an outburst of strong emotion or feeling: He suddenly broke into a passion of bitter words.
9.violent anger.
10.the state of being acted upon or affected by something external, esp. something alien to one's nature or one's customary behavior (contrasted with action).
11.(often initial capital letter ) Theology.
a.the sufferings of Christ on the cross or His sufferings subsequent to the Last Supper.
b.the narrative of Christ's sufferings as recorded in the Gospels.