Kamasutra 3.5.23

3.5.23

bhrātaram asyā vā samānavayasaṃ veśyāsu parastrīṣu vā prasaktam asukareṇa sāhāyadānena priyopagrahaiś ca sudīrghakālam anurañjayet/ ante ca svābhiprāyaṃ grāhayet/

(3) The man should become a great friend of the brother of the girl, the said brother being of the same age as himself, and addicted to courtezans, and to intrigues with the wives of other people, and should give him assistance in such matters, and also give him occasional presents. He should then tell him about his great love for his sister, as young men will sacrifice even their lives for the sake of those who may be of the same age, habits, and dispositions as themselves. After this the man should get the girl brought by means of her brother to some secure place, and having brought fire from the house of a Brahman should proceed as before.