Your step-mom is upset and is being left by her husband for another woman. She knows hes been unfaithful for years yet he doesn't want to put effort into fixing the relationship. Shes hurt and hurt bad. You cant stand to see her like this and let her know that you would never hurt her like him. You tell her that you'll take his place this evening but she doesn't quite seem to understand. So you show her what you really mean. She resist your advances at first as its clearly inappropriate but you touching her feels so good and she is quite upset still. You convince her to let you help her feel better and she agrees letting you slip your fingers inside of her. She is clearly enjoying it and before long decides it isn't fair that shes the only one getting enjoyment and decides she will stroke you while you finger her. Shes completely surprised by you massive cock. She ask to suck on it and quickly gets horny from your big cock. She gives in and lets you make her feel all better.