Your AC increases by 2 and your Strength Score increases by 2.

You have sharp fangs that can inject venom into your victims, and you are proficient with them. As an action, you can bite a creature for 2d4 (+ proficiency bonus)piercing damage, then the creature must make a Constitution saving throw (DC 9 + DEX Modifier + Proficiency bonus) or take another 2d4 poison damage and becomes poisoned for 2 minutes. 

As an action, you can attempt to constrict any creature no more than one size larger than yourself. You have advantage on all attempts (Strength-Athletic checks) to grapple the target, and the target is considered restrained and has disadvantage on all attempts to break the grapple. Additionally, the target must take 2d6 (+ Strength + Proficiency bonus) bludgeoning damage at the beginning of your turn. This is considered a simple melee weapon that you are proficient with. You can use this action twice per short rest at 1st level, 3 times at 6th level, 4 times at 11th, and 6 times at 17 level.

Also, you can use your tail as a means to carry small objects. You have advantage on all Sleight of Hand checks made using your tail.

Your languages are Common and Draconic, and you can speak to snakes as if you shared a language. The snake can share recent memories and you can share simple commands, questions, or concepts with them.

You have proficiency on Perception, Intimidation, and Deception Checks.

Your speed increases from 30 feet to 35 feet.

You can cast the poison spray cantrip at will. Starting at 3rd level, you can cast suggestion with this trait. Once you cast it, you can’t do so again until you finish a long rest. Starting at 5th level, you can cast fear with this trait. Once you cast it, you can't do so again until you finish a long rest. Intelligence is your spellcasting ability for these spells. At 7th level, you can cast polymorph to change into a large constrictor snake at will. You cannot cast any spells other than polymorph to shift back out of this form.