The visitors looked to have wrapped up the points at half-time thanks to Chahir Belghazouani, Adrian Mutu and an Eduardo Dos Santos double, with Wesley Lautoa's effort looking decidedly lonely for Lorient.
However, Jeremie Aliadiere sparked the second-half fightback with a brace of his own before Sunu's goal in the fourth minute of stoppage time sealed an unlikely point.
Florian Thauvin scored a double as Bastia beat Bordeaux 3-1 to inflict a first Ligue 1 defeat in over six months on Francis Gillot's men.
The 19-year-old Thauvin stunned Les Girondins with two quickfire goals in the opening 17 minutes, Yoan Gouffran managing to respond just before the break.
But when Wahbi Khazri doubled the Corsicans' lead once again with a well-taken free-kick, Bordeaux had no answer and duly lost their first league outing since April.
Marseille's home match against Lyon was postponed due to high winds.
A meeting at the Stade Velodrome during the afternoon saw officials reach the decision. No new date has been set for the fixture.
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