Ibn Abbas (may Allah be pleased with them both) said: Whenever the Messenger of Allah (peace and blessings be upon him) touched the Yamani Corner, he would kiss it and place his right cheek on it.
Only Abdullah bin Muslim bin Hurmuz narrated it, and he is da'if (weak). The reports from Ibn Abbas concern kissing the Black Stone and prostrating on it, unless by the Yamani Corner he meant the Black Stone, for it too is called by that name, in which case it agrees with the other reports.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9236